BELAR FMM-2 FM MODULATION MONITOR
The Belar Model FMM-2 FM Modulation Monitor is a precision wideband, all solid state FM monitor, designed to measure the total modulation characteristics of monaural as well as multiplexed FM transmitters. The Model FMM-2 is also used as a low distortion and low noise FM demodulator to drive the companion stereo and SCA monitors, as well as providing audio outputs for aural monitoring and proof of performance measurements.
The Model FMM-2 has set new standards in totally accurate measurement techniques. Utilizing such advanced design features as an ultra-linear digital discriminator, an almost distortionless and absolutely flat baseband signal is produced to ensure precise stereo and SCA decoding.
In addition to the normal FCC defined semi-peak metering, the FMM-2 incorporates a sample-hold peak modulation meter circuit, independent of modulation polarity, to allow the meter to respond accurately to program peaks.
Frequency Range 88 to 108 mHz std. (fixed - specify carrier freq.) RF Input 1 to 10 volts rms, 50 ohms, BNC connector Modulation Metering: Deviation Indication 100% @ +/- 75 kHz, 0 to 133% range Accuracy +/-2% @ all modulation levels Characteristics selectable: peak (sample-hold) or semi-peak Noise Measurement: FM Noise Range - 50 dB to - 70 dB AM Noise Range - 50 dB to - 70 dB Test Function: Calibrate Provides internal standard deviation reference Zero Provides zero deviation for s/n RF Level Calibrates AM noise function and carrier alarm reference level Carrier Alarm Indicator adjusted for 90% carrier level Outputs: Stereo Monitor Wideband, 1.5v rms @ 1kohm unbalanced SCA Monitor Wideband, 1.5v rms @ 1 kohm unbalanced Audio, (Program) + 10 dBm, 600 ohms, balanced Audio, (Test) 5v rms, 10k ohms, unbalanced Audio Output Specifications Frequency Response +/- 0.01 dB Harmonic Distortion 0.01 % max Intermodulation Distortion 0.01% max (SMPTE) Signal-to-Noise Ratio 90 dB, min Remote Outputs Carrier Level Alarm Provides "open collector" output, capable of sinking 20 ma @ 15 vdc Meter 100% Peak Indicator, Adj. Peak Indicator For interface to Model MP-8 Remote Meter Panel (opt) Dimensions 5.25"H x 10.5"D x 19"W (EIA Rack Mount) Power Consumption 10 watts, 117 VAC std. (234 VAC opt) 50/60 Hz Shipping Weight 12 Ibs© Copyright 2000 Belar Electronics Laboratory, Inc. All rights reserved. Specifications subject to change without prior notice.
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